My principal activity is to hunt down spelling or grammar mistakes, misnomers, or other aberrations as those. Moreover, I try to correct wrong information about topics I am interested in (mainly linguistics). I'm trying to learn Саха тыла (Saha tyla) but I can't find it in the Babel template.
I am also active on Wiktionary, where I rectify incorrect pronunciations thanks to my IPA knowledge.
Furthermore, I often dwell on bad romanizations of words written in a non-latin alphabet (mostly Cyrillic) as "борщ", which is often romanized in "borsch" instead of "borŝ".
You understood it well, I am a bit fussy about some subjects but when I do something I like, I do it well and entirely.